Summary of the content on the page No. 1
W7340, W7345
Communicating Economizer Logic Modules
FOR VENTILATION CONTROL
PRODUCT DATA
FEATURES
• Solid state control package provides accuracy,
reliability and stability.
• Housed in high-impact, glass-fiber reinforced plastic
W7340
case.
• Terminals included for connecting optional S963B1136
Remote Potentiometer for remote minimum damper
position control.
• Communicates using a modified Modbus protocol.
• Case matches the lines of the M7215 Damper Motor.
W7345
• LED indicates the status
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES Approvals: SPECIFICATIONS cUL listed. Underwriters Laboratories Inc. listed: Models: Meets UL873 plenum requirements. W7340: Communicating Economizer Logic Module with Meets UL94-5VA plenum flammability requirements. minimum position potentiometer, setpoints for enthalpy or FCC Part 15 Class B. dry-bulb, and DCV. CE. W7345: Communicating Economizer Logic Module with This product complies with Title 24 Part 6 CEC standard for minimum positio
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES Table 1. Logic Module Inputs and Outputs. Location and Mounting W7340 W7345 Inputs Communicating Economizer Logic Modules a When planning the installation, allow enough clearance for Enthalpy — 4-20 mA maintenance and service. Mount the device in a location Modbus yes yes protected from rain, snow, and direct sunlight. The logic module mounts on the side of an M7215 Damper Motor or Return Sensor optional — directly on a sheet metal duct or
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES IMPORTANT • Ensure proper polarity of sensor connections. Incorrect polarity negates the sensor signal. W7340B: The W7340B DCV economizer logic modules incorporate a minimum position setting that defaults to 20%, but can be overridden using the Modbus communication link. The W7340B DCV maximum position sets the damper position to a position that the damper goes to if the CO sensor fails. If 2 the minimum position set point is higher than t
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES 10K NTC INDOOR MODBUS DISCHARGE C7232 AIR CO2 2 AIR SENSOR SENSOR DIRECT MIXED AIR EXPANSION 10K SENSOR 1 COIL C7400 NTC 2 INDOOR 3 FAN ENTHALPY SENSOR DISCHARGE AIR OUTDOOR M7215 MOTOR WITH W7340 AIR ECONOMIZER LOGIC MODULE 1 C7400 3 1 FOR DIFFERENTIAL ENTHALPY, THE TWO C7400 ENTHALPY SENSORS ARE CONNECTED TO THE ECONOMIZER MODULE—ONE IS MOUNTED ENTHALPY SENSOR IN THE RETURN AIR DUCT, AND THE OTHER IS MOUNTED IN THE OUTDOOR AIR DUCT. DIFFE
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES IMPORTANT WIRING 1. All wiring must comply with applicable local codes, ordinances and regulations. 2. Refer to Figures 6 and 7 for typical wiring diagrams. 3. All inputs and outputs to the device must be 24 Vac CAUTION Class 2. Electrical Shock or Equipment Damage Hazard. 4. Ensure proper polarity of sensor connections. Can shock individuals or short equipment Incorrect polarity negates the sensor signal. circuitry. Disconnect power supply
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES MOD BUS – MOD BUS + M7215 24 VAC TR1 TR W7345 MOD – L1 1 BUS 24 VAC + L2 – + C B D MINIMUM POSITION AE 2 S963B R CCW CW MIXED OPEN CLOSE AIR TEMP SENSOR B W 10K NTC 1 PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 OPTIONAL REMOTE MINIMUM POSITION POTENTIOMETER. M23876 Fig. 7. W7345 Typical Wiring. OPERATION SETTINGS AND ADJUSTMENT The purpose of the economizer logic modules are to use W7345 outdoor air for cooling, whenever
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES Table 2. W7340 Economizer I/O Logic. W7340 Potentiometers with screwdriver adjustment slots, located on INPUTS OUTPUTS the face of the device, provide adjustments for several a Enthalpy Compressor parameters (See Fig. 9 for locations on device): b b — DCV minimum and minimum damper position. DCV Outdoor Return Y1 Y2 Stage 1 Stage 2 Damper — Enthalpy changeover. Below High Low On On On On Minimum — DCV setpoint. set position On Off On Off MIN
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES Limit On Minimum Damper Position Differential Enthalpy Changeover Setting On the W7340A and B models, the logic module as shipped Differential enthalpy control uses: from the factory, limits the minimum position setpoint to 50%. — W7340A and B use two C7400A Enthalpy Sensors The logic module will not allow a minimum position greater connected to one logic module, or than 50% open (from fully closed). — Two 10K NTC temperature sensors and two C
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES 85 90 95 100 105 110 (29) (32) (35) (38) (41) (43) CONTROL CONTROL POINT CURVE APPROX. °F (°C) 80 AT 50% RH (27) A 73 (23) B 70 (21) C 67 (19) D 63 (17) E 55 (13) 75 (24) 70 (21) 65 (18) 60 (16) A 55 (13) B 50 C (10) 45 D (7) 40 E (4) 35 (2) 1 A B C D E 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 (2) (4) (7) (10) (13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43) APPROXIMATE DRY BULB TEMPERATURE— °F (°C) 1 M23879 HIGH LIMIT CU
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES Table 4. W7340 Economizer Checkout. TROUBLESHOOTING Pulse Diagnostic Description count bit The status LED is visible through a hole in the device cover. A priority-based LED flash sequence indicates a detected fault. Booting (0-3 min. after power-up) NA 12 0.25 seconds elapses between each pulse, a higher pulse Mixed air temperature sensor fault 87 count indicates higher priority. A two-second on period precedes each repeated sequence. Out
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W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered Trademark © 2007 Honeywell International Inc. 63-2569—04 J.I. Rev. 06-07
